Visualize CPU idle time as dots on the command line.

idledots.sh

#!/bin/sh
# idle cpu as dots
vmstat -n 1 | while read line; do
  length=`echo $line|awk '{print $15}'|egrep "^[0-9]+$"`
  test -n "$length" && {
    echo -n $length
    for e in `seq 1 $length `; do echo -n .; done;
    echo '';
  } || true
done